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arXiv · 1812.05999

Al'tshuler-Aronov-Spivak oscillations of bosonic matter-wave beams in the presence of interaction

Renaud Chrétien·Josef Rammensee·Julien Dujardin·Cyril Petitjean·Peter Schlagheck
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Abstract

We theoretically study the propagation of a guided atom laser across an Aharonov-Bohm ring which is exposed to a synthetic gauge field. The presence of disorder within the ring gives rise to Al'tshuler-Aronov-Spivak oscillations, seen in the disorder average of the transmission as a function of the effective gauge flux that is contained within the ring. Those oscillations are induced by coherent backscattering and represent a manifestation of weak localization. Through analytical and numerical calculations that are based on the mean-field Gross-Pitaevskii approximation for the propagating Bose-Einstein condensate, we show that the presence of a very weak atom-atom interaction within the ring leads to an inversion of the Al'tshuler-Aronov-Spivak oscillations, in a very similar manner as for the coherent backscattering of Bose-Einstein condensates within two-dimensional disorder potentials. Numerical simulations based on the Truncated Wigner method reveal that this signature of weak antilocalization becomes washed out if the interaction strength is increased.

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Renaud Chrétien, Josef Rammensee, Julien Dujardin, Cyril Petitjean, Peter Schlagheck. 2019-09-06. Al'tshuler-Aronov-Spivak oscillations of bosonic matter-wave beams in the presence of interaction. https://doi.org/10.1103/physreva.100.033606

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